What are some alternatives?
When comparing Teachable and Treehouse, you can also consider the following products
newrow - Create your online school and deliver interactive content.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
Clever.com - syncing between education applications for K-12 schools
Claroline - Claroline is a collaborative eLearning and eWorking platform.
LanSchool - Get the best classroom management and monitoring software to inspire collaborative teaching with tools to minimize distractions and maintain an effective learning environment.
Wikispaces - Wikispaces is a social writing platform for education.